Weegy: Operation Vietnam User: What gave President Johnson the authority to increase U.S. involvement in Vietnam?
A. the Gulf of Tonkin Resolution
B. the Truman Doctrine
C. the domino theory
D. the War Powers Act
Weegy: Lyndon B. Johnson , U.S. President Born ... to pass the Tonkin Gulf resolution gave Johnson the authority ... sharp increase in American military involvement in the Vietnam War ... [ ] User: Operation Rolling Thunder ... (More)